Determining Bore Size..

Discussion in 'Trumpet Discussion' started by mbtpter227, Feb 5, 2007.

  1. mbtpter227

    mbtpter227 New Friend

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    Feb 3, 2007
    So-Cal
    Sorry if this is a stupid question, but how do you determine the bore size in an LA-era Benge Bb trumpet? (Serial #27XXX)

    Thanks guys. :cool:
     
  2. Richard Oliver

    Richard Oliver Forte User

    1,832
    166
    Jul 18, 2006
    Casper, WY
    Matt,

    Look at the valve casing. Do you see an ML, MLP, or L, or CG there?

    I've forgotten the bore sizes, and the specifics of the CG step bore.

    http://www.dallasmusic.org/gearhead/Benge.html

    That link should get you started.

    All the Best,

    Richard
     
  3. mbtpter227

    mbtpter227 New Friend

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    Feb 3, 2007
    So-Cal
    Thanks Richard.

    I found that the valve casing reads "ML." This must mean that it is a medium-large bore, correct?

    I still can't figure out what type of trumpet it is (2x, 3x, 4x, 5x).

    I'm putting a wild guess that it's a 3x, haha.
     
  4. Richard Oliver

    Richard Oliver Forte User

    1,832
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    Jul 18, 2006
    Casper, WY
    Matt,

    I've flat out forgotten if the # 3, 4, 5, etc appears on the bell.

    Someone in here will no for sure. Find some posts by topo3man, and pm him.

    He's a fine gent and loves Benges. He'll know, as will others in here.

    Richard
     
  5. gtromble

    gtromble Pianissimo User

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    Dec 31, 2005
    On the LA Benges, the number is probably stamped on the bell. All the ones I have owned have had that -- most 3, one 5. My Burbank Benge does not have the number on the bell, though the bell flare looks like a 5. The huge majority of Benges produced were the 3 bell.

    The ML bore is .460.

    The standard way to measure the bore is to measure the inside diameter at the 2nd valve slide with a pair of calipers.

    GT
     
  6. Dave Mickley

    Dave Mickley Forte User

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    Nov 11, 2005
    Indianapolis
    if the number is not stamped on the bell, it will be on the ferrel that connects the bell to the 1st valve. Dave
     
  7. mbtpter227

    mbtpter227 New Friend

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    Feb 3, 2007
    So-Cal
    It turns out to be a 3, just as I guessed.

    Thanks for the help :cool:
     

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